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                    前言
            
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                    第一章：起步
            
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                    1.1：移动开发技术简介
            
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                    1.2：初识Flutter
            
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                    1.3：搭建Flutter开发环境
            
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                    1.4：Dart语言简介
            
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                    第二章：第一个Flutter应用
            
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                    2.1：计数器示例
            
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                    2.2：路由管理
            
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                    2.3：包管理
            
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                    2.4：资源管理
            
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                    2.5：调试Flutter APP
            
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                    2.6：Dart线程模型及异常捕获
            
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                    第三章：基础组件
            
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                    3.1：Widget简介
            
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                    3.2：状态管理
            
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                    3.3：文本、字体样式
            
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                    3.4：按钮
            
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                    3.5：图片和Icon
            
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                    3.6：单选框和复选框
            
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                    3.7：输入框和表单
            
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                    3.8：进度指示器
            
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                    第四章：布局类组件
            
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                    4.1：布局类组件简介
            
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                    4.2：线性布局（Row、Column）
            
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                    4.3：弹性布局（Flex）
            
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                    4.4：流式布局（Wrap、Flow）
            
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                    4.5：层叠布局（Stack、Positioned）
            
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                    4.6：对齐与相对定位（Align）
            
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                    第五章：容器类组件
            
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                    5.1：填充（Padding）
            
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                    5.2：尺寸限制类容器（ConstrainedBox等）
            
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                    5.3：装饰容器（DecoratedBox）
            
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                    5.4：变换（Transform）
            
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                    5.5：Container容器
            
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                    5.6：Scaffold、TabBar、底部导航
            
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                    5.7：剪裁（Clip）
            
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                    第六章：可滚动组件
            
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                    6.1：可滚动组件简介
            
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                    6.2：SingleChildScrollView
            
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                    6.3：ListView
            
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                    6.4：GridView
            
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                    6.5：CustomScrollView
            
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                    6.6：滚动监听及控制（ScrollController）
            
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                    第七章：功能型组件
            
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                    7.1：导航返回拦截（WillPopScope）
            
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                    7.2：数据共享（InheritedWidget）
            
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                    7.3： 跨组件状态共享（Provider）
            
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                    7.4：颜色和主题（Theme）
            
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                    7.5：异步UI更新（FutureBuilder、StreamBuilder）
            
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                    7.6：对话框详解
            
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        <li class="header">进阶篇</li>
        
        
    
        <li class="chapter " data-level="3.1" data-path="../chapter8/">
            
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                    第八章：事件处理与通知
            
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        <li class="chapter " data-level="3.1.1" data-path="../chapter8/listener.html">
            
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                    8.1：原始指针事件处理
            
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        <li class="chapter " data-level="3.1.2" data-path="../chapter8/gesture.html">
            
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                    8.2：手势识别
            
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        <li class="chapter " data-level="3.1.3" data-path="../chapter8/eventbus.html">
            
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                    8.3：全局事件总线
            
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                    8.4：通知(Notification)
            
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        <li class="chapter " data-level="3.2" data-path="../chapter9/">
            
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                    第九章：动画
            
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        <li class="chapter " data-level="3.2.1" data-path="../chapter9/intro.html">
            
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                    9.1：Flutter动画简介
            
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                    9.2：动画结构
            
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                    9.3：自定义路由过渡动画
            
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                    9.4：Hero动画
            
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                    9.5：交织动画
            
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                    9.6：通用“动画切换”组件（AnimatedSwitcher）
            
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                    9.7：动画过渡组件
            
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        <li class="chapter " data-level="3.3" data-path="../chapter10/">
            
                <a href="../chapter10/">
            
                    
                    第十章：自定义组件
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.3.1" data-path="../chapter10/intro.html">
            
                <a href="../chapter10/intro.html">
            
                    
                    10.1：自定义组件方法简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.2" data-path="../chapter10/combine.html">
            
                <a href="../chapter10/combine.html">
            
                    
                    10.2：组合现有组件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.3" data-path="../chapter10/turn_box.html">
            
                <a href="../chapter10/turn_box.html">
            
                    
                    10.3：组合实例：TurnBox
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.4" data-path="../chapter10/custom_paint.html">
            
                <a href="../chapter10/custom_paint.html">
            
                    
                    10.4：自绘组件（CustomPaint与Canvas）
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.5" data-path="../chapter10/gradient_circular_progress_demo.html">
            
                <a href="../chapter10/gradient_circular_progress_demo.html">
            
                    
                    10.5：自绘实例：圆形渐变进度条(自绘)
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.4" data-path="../chapter11/">
            
                <a href="../chapter11/">
            
                    
                    第十一章：文件操作与网络请求
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.4.1" data-path="../chapter11/file_operation.html">
            
                <a href="../chapter11/file_operation.html">
            
                    
                    11.1：文件操作
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.2" data-path="../chapter11/http.html">
            
                <a href="../chapter11/http.html">
            
                    
                    11.2：Http请求-HttpClient
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.3" data-path="../chapter11/dio.html">
            
                <a href="../chapter11/dio.html">
            
                    
                    11.3：Http请求-Dio package
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.4" data-path="../chapter11/download_with_chunks.html">
            
                <a href="../chapter11/download_with_chunks.html">
            
                    
                    11.4：实例：Http分块下载
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.5" data-path="../chapter11/websocket.html">
            
                <a href="../chapter11/websocket.html">
            
                    
                    11.5：WebSocket
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.6" data-path="../chapter11/socket.html">
            
                <a href="../chapter11/socket.html">
            
                    
                    11.6：使用Socket API
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.7" data-path="../chapter11/json_model.html">
            
                <a href="../chapter11/json_model.html">
            
                    
                    11.7：Json转Dart Model类
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.5" data-path="../chapter12/">
            
                <a href="../chapter12/">
            
                    
                    第十二章：包与插件
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.5.1" data-path="../chapter12/develop_package.html">
            
                <a href="../chapter12/develop_package.html">
            
                    
                    12.1：开发package
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.2" data-path="../chapter12/platform-channel.html">
            
                <a href="../chapter12/platform-channel.html">
            
                    
                    12.2：平台通道简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.3" data-path="../chapter12/develop_plugin.html">
            
                <a href="../chapter12/develop_plugin.html">
            
                    
                    12.3：开发Flutter插件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.4" data-path="../chapter12/android_implement.html">
            
                <a href="../chapter12/android_implement.html">
            
                    
                    12.4：插件开发：实现Android端API
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.5" data-path="../chapter12/ios_implement.html">
            
                <a href="../chapter12/ios_implement.html">
            
                    
                    12.5：插件开发：实现IOS端API
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.6" data-path="../chapter12/texture_platformview.html">
            
                <a href="../chapter12/texture_platformview.html">
            
                    
                    12.6：Texture和PlatformView
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.6" data-path="../chapter13/">
            
                <a href="../chapter13/">
            
                    
                    第十三章：国际化
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.6.1" data-path="../chapter13/multi_languages_support.html">
            
                <a href="../chapter13/multi_languages_support.html">
            
                    
                    13.1：让App支持多语言
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.2" data-path="../chapter13/locallization_implement.html">
            
                <a href="../chapter13/locallization_implement.html">
            
                    
                    13.2：实现Localizations
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.3" data-path="../chapter13/intl.html">
            
                <a href="../chapter13/intl.html">
            
                    
                    13.3：使用Intl包
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.4" data-path="../chapter13/faq.html">
            
                <a href="../chapter13/faq.html">
            
                    
                    13.4：国际化常见问题
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.7" data-path="../chapter14/">
            
                <a href="../chapter14/">
            
                    
                    第十四章：Flutter核心原理
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.7.1" data-path="../chapter14/flutter_ui_system.html">
            
                <a href="../chapter14/flutter_ui_system.html">
            
                    
                    14.1：Flutter UI系统
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.2" data-path="../chapter14/element_buildcontext.html">
            
                <a href="../chapter14/element_buildcontext.html">
            
                    
                    14.2：Element和BuildContext
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.3" data-path="../chapter14/render_object.html">
            
                <a href="../chapter14/render_object.html">
            
                    
                    14.3：RenderObject与RenderBox
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.4" data-path="../chapter14/flutter_app_startup.html">
            
                <a href="../chapter14/flutter_app_startup.html">
            
                    
                    14.4：Flutter从启动到显示
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.5" data-path="../chapter14/image_and_cache.html">
            
                <a href="../chapter14/image_and_cache.html">
            
                    
                    14.5：Flutter图片加载与缓存
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">实例篇</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../chapter15/intro.html">
            
                <a href="../chapter15/intro.html">
            
                    
                    第十五章：一个完整的Flutter应用
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="4.1.1" data-path="../chapter15/intro.html">
            
                <a href="../chapter15/intro.html">
            
                    
                    15.1：应用简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.2" data-path="../chapter15/code_structure.html">
            
                <a href="../chapter15/code_structure.html">
            
                    
                    15.2：APP代码结构
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.3" data-path="../chapter15/models.html">
            
                <a href="../chapter15/models.html">
            
                    
                    15.3：Model类定义
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.4" data-path="../chapter15/globals.html">
            
                <a href="../chapter15/globals.html">
            
                    
                    15.4：全局变量及共享状态
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.5" data-path="../chapter15/network.html">
            
                <a href="../chapter15/network.html">
            
                    
                    15.5：网络请求封装
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.6" data-path="../chapter15/entry.html">
            
                <a href="../chapter15/entry.html">
            
                    
                    15.6：App入口及首页
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.7" data-path="../chapter15/login_page.html">
            
                <a href="../chapter15/login_page.html">
            
                    
                    15.7：登录页
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.8" data-path="../chapter15/language_and_theme_setting.html">
            
                <a href="../chapter15/language_and_theme_setting.html">
            
                    
                    15.8：多语言和多主题
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    

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                                <h1 id="56-scaffold&#x3001;tabbar&#x3001;&#x5E95;&#x90E8;&#x5BFC;&#x822A;">5.6 Scaffold&#x3001;TabBar&#x3001;&#x5E95;&#x90E8;&#x5BFC;&#x822A;</h1>
<p>Material&#x7EC4;&#x4EF6;&#x5E93;&#x63D0;&#x4F9B;&#x4E86;&#x4E30;&#x5BCC;&#x591A;&#x6837;&#x7684;&#x7EC4;&#x4EF6;&#xFF0C;&#x672C;&#x8282;&#x4ECB;&#x7ECD;&#x4E00;&#x4E9B;&#x5E38;&#x7528;&#x7684;&#x7EC4;&#x4EF6;&#xFF0C;&#x5176;&#x4F59;&#x7684;&#x8BFB;&#x8005;&#x53EF;&#x4EE5;&#x81EA;&#x884C;&#x67E5;&#x770B;&#x6587;&#x6863;&#x6216;Flutter Gallery&#x4E2D;Material&#x7EC4;&#x4EF6;&#x90E8;&#x5206;&#x7684;&#x793A;&#x4F8B;&#x3002;</p>
<blockquote>
<p>Flutter Gallery&#x662F;Flutter&#x5B98;&#x65B9;&#x63D0;&#x4F9B;&#x7684;Flutter Demo&#xFF0C;&#x6E90;&#x7801;&#x4F4D;&#x4E8E;flutter&#x6E90;&#x7801;&#x4E2D;&#x7684;examples&#x76EE;&#x5F55;&#x4E0B;&#xFF0C;&#x7B14;&#x8005;&#x5F3A;&#x70C8;&#x5EFA;&#x8BAE;&#x7528;&#x6237;&#x5C06;Flutter Gallery&#x793A;&#x4F8B;&#x8DD1;&#x8D77;&#x6765;&#xFF0C;&#x5B83;&#x662F;&#x4E00;&#x4E2A;&#x5F88;&#x5168;&#x9762;&#x7684;Flutter&#x793A;&#x4F8B;&#x5E94;&#x7528;&#xFF0C;&#x662F;&#x975E;&#x5E38;&#x597D;&#x7684;&#x53C2;&#x8003;Demo&#xFF0C;&#x4E5F;&#x662F;&#x7B14;&#x8005;&#x5B66;&#x4E60;Flutter&#x7684;&#x7B2C;&#x4E00;&#x624B;&#x8D44;&#x6599;&#x3002;</p>
</blockquote>
<h2 id="561-scaffold">5.6.1 Scaffold</h2>
<p>&#x4E00;&#x4E2A;&#x5B8C;&#x6574;&#x7684;&#x8DEF;&#x7531;&#x9875;&#x53EF;&#x80FD;&#x4F1A;&#x5305;&#x542B;&#x5BFC;&#x822A;&#x680F;&#x3001;&#x62BD;&#x5C49;&#x83DC;&#x5355;(Drawer)&#x4EE5;&#x53CA;&#x5E95;&#x90E8;Tab&#x5BFC;&#x822A;&#x83DC;&#x5355;&#x7B49;&#x3002;&#x5982;&#x679C;&#x6BCF;&#x4E2A;&#x8DEF;&#x7531;&#x9875;&#x9762;&#x90FD;&#x9700;&#x8981;&#x5F00;&#x53D1;&#x8005;&#x81EA;&#x5DF1;&#x624B;&#x52A8;&#x53BB;&#x5B9E;&#x73B0;&#x8FD9;&#x4E9B;&#xFF0C;&#x8FD9;&#x4F1A;&#x662F;&#x4E00;&#x4EF6;&#x975E;&#x5E38;&#x9EBB;&#x70E6;&#x4E14;&#x65E0;&#x804A;&#x7684;&#x4E8B;&#x3002;&#x5E78;&#x8FD0;&#x7684;&#x662F;&#xFF0C;Flutter Material&#x7EC4;&#x4EF6;&#x5E93;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E9B;&#x73B0;&#x6210;&#x7684;&#x7EC4;&#x4EF6;&#x6765;&#x51CF;&#x5C11;&#x6211;&#x4EEC;&#x7684;&#x5F00;&#x53D1;&#x4EFB;&#x52A1;&#x3002;<code>Scaffold</code>&#x662F;&#x4E00;&#x4E2A;&#x8DEF;&#x7531;&#x9875;&#x7684;&#x9AA8;&#x67B6;&#xFF0C;&#x6211;&#x4EEC;&#x4F7F;&#x7528;&#x5B83;&#x53EF;&#x4EE5;&#x5F88;&#x5BB9;&#x6613;&#x5730;&#x62FC;&#x88C5;&#x51FA;&#x4E00;&#x4E2A;&#x5B8C;&#x6574;&#x7684;&#x9875;&#x9762;&#x3002;</p>
<h3 id="&#x793A;&#x4F8B;">&#x793A;&#x4F8B;</h3>
<p>&#x6211;&#x4EEC;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;&#x9875;&#x9762;&#xFF0C;&#x5B83;&#x5305;&#x542B;&#xFF1A;</p>
<ol>
<li>&#x4E00;&#x4E2A;&#x5BFC;&#x822A;&#x680F;</li>
<li>&#x5BFC;&#x822A;&#x680F;&#x53F3;&#x8FB9;&#x6709;&#x4E00;&#x4E2A;&#x5206;&#x4EAB;&#x6309;&#x94AE;</li>
<li>&#x6709;&#x4E00;&#x4E2A;&#x62BD;&#x5C49;&#x83DC;&#x5355;</li>
<li>&#x6709;&#x4E00;&#x4E2A;&#x5E95;&#x90E8;&#x5BFC;&#x822A;</li>
<li>&#x53F3;&#x4E0B;&#x89D2;&#x6709;&#x4E00;&#x4E2A;&#x60AC;&#x6D6E;&#x7684;&#x52A8;&#x4F5C;&#x6309;&#x94AE;</li>
</ol>
<p>&#x6700;&#x7EC8;&#x6548;&#x679C;&#x5982;&#x56FE;5-18&#x3001;&#x56FE;5-19&#x6240;&#x793A;&#xFF1A;</p>
<p><img src="https://pcdn.flutterchina.club/imgs/5-18.png" alt="&#x56FE;5-18"> <img src="https://pcdn.flutterchina.club/imgs/5-19.png" alt="&#x56FE;5-19"></p>
<p>&#x5B9E;&#x73B0;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">ScaffoldRoute</span> <span class="token keyword">extends</span> <span class="token class-name">StatefulWidget</span> <span class="token punctuation">{</span>
  <span class="token metadata symbol">@override</span>
  _ScaffoldRouteState <span class="token function">createState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">_ScaffoldRouteState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">_ScaffoldRouteState</span> <span class="token keyword">extends</span> <span class="token class-name">State</span><span class="token operator">&lt;</span>ScaffoldRoute<span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  int _selectedIndex <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>

  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">Scaffold</span><span class="token punctuation">(</span>
      appBar<span class="token punctuation">:</span> <span class="token function">AppBar</span><span class="token punctuation">(</span> <span class="token comment">//&#x5BFC;&#x822A;&#x680F;</span>
        title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;App Name&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span> 
        actions<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span> <span class="token comment">//&#x5BFC;&#x822A;&#x680F;&#x53F3;&#x4FA7;&#x83DC;&#x5355;</span>
          <span class="token function">IconButton</span><span class="token punctuation">(</span>icon<span class="token punctuation">:</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>share<span class="token punctuation">)</span><span class="token punctuation">,</span> onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
        <span class="token punctuation">]</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
      drawer<span class="token punctuation">:</span> <span class="token keyword">new</span> <span class="token class-name">MyDrawer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment">//&#x62BD;&#x5C49;</span>
      bottomNavigationBar<span class="token punctuation">:</span> <span class="token function">BottomNavigationBar</span><span class="token punctuation">(</span> <span class="token comment">// &#x5E95;&#x90E8;&#x5BFC;&#x822A;</span>
        items<span class="token punctuation">:</span> <span class="token operator">&lt;</span>BottomNavigationBarItem<span class="token operator">&gt;</span><span class="token punctuation">[</span>
          <span class="token function">BottomNavigationBarItem</span><span class="token punctuation">(</span>icon<span class="token punctuation">:</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>home<span class="token punctuation">)</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&apos;Home&apos;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token function">BottomNavigationBarItem</span><span class="token punctuation">(</span>icon<span class="token punctuation">:</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>business<span class="token punctuation">)</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&apos;Business&apos;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token function">BottomNavigationBarItem</span><span class="token punctuation">(</span>icon<span class="token punctuation">:</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>school<span class="token punctuation">)</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&apos;School&apos;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
        <span class="token punctuation">]</span><span class="token punctuation">,</span>
        currentIndex<span class="token punctuation">:</span> _selectedIndex<span class="token punctuation">,</span>
        fixedColor<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">,</span>
        onTap<span class="token punctuation">:</span> _onItemTapped<span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
      floatingActionButton<span class="token punctuation">:</span> <span class="token function">FloatingActionButton</span><span class="token punctuation">(</span> <span class="token comment">//&#x60AC;&#x6D6E;&#x6309;&#x94AE;</span>
          child<span class="token punctuation">:</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>add<span class="token punctuation">)</span><span class="token punctuation">,</span>
          onPressed<span class="token punctuation">:</span>_onAdd
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">void</span> <span class="token function">_onItemTapped</span><span class="token punctuation">(</span>int index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      _selectedIndex <span class="token operator">=</span> index<span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">void</span> <span class="token function">_onAdd</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#x6211;&#x4EEC;&#x7528;&#x5230;&#x4E86;&#x5982;&#x4E0B;&#x7EC4;&#x4EF6;&#xFF1A;</p>
<table>
<thead>
<tr>
<th>&#x7EC4;&#x4EF6;&#x540D;&#x79F0;</th>
<th>&#x89E3;&#x91CA;</th>
</tr>
</thead>
<tbody>
<tr>
<td>AppBar</td>
<td>&#x4E00;&#x4E2A;&#x5BFC;&#x822A;&#x680F;&#x9AA8;&#x67B6;</td>
</tr>
<tr>
<td>MyDrawer</td>
<td>&#x62BD;&#x5C49;&#x83DC;&#x5355;</td>
</tr>
<tr>
<td>BottomNavigationBar</td>
<td>&#x5E95;&#x90E8;&#x5BFC;&#x822A;&#x680F;</td>
</tr>
<tr>
<td>FloatingActionButton</td>
<td>&#x6F02;&#x6D6E;&#x6309;&#x94AE;</td>
</tr>
</tbody>
</table>
<p>&#x4E0B;&#x9762;&#x6211;&#x4EEC;&#x6765;&#x5206;&#x522B;&#x4ECB;&#x7ECD;&#x4E00;&#x4E0B;&#x5B83;&#x4EEC;&#x3002;</p>
<h2 id="562-appbar">5.6.2 AppBar</h2>
<p><code>AppBar</code>&#x662F;&#x4E00;&#x4E2A;Material&#x98CE;&#x683C;&#x7684;&#x5BFC;&#x822A;&#x680F;&#xFF0C;&#x901A;&#x8FC7;&#x5B83;&#x53EF;&#x4EE5;&#x8BBE;&#x7F6E;&#x5BFC;&#x822A;&#x680F;&#x6807;&#x9898;&#x3001;&#x5BFC;&#x822A;&#x680F;&#x83DC;&#x5355;&#x3001;&#x5BFC;&#x822A;&#x680F;&#x5E95;&#x90E8;&#x7684;Tab&#x6807;&#x9898;&#x7B49;&#x3002;&#x4E0B;&#x9762;&#x6211;&#x4EEC;&#x770B;&#x770B;AppBar&#x7684;&#x5B9A;&#x4E49;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">AppBar</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  Key key<span class="token punctuation">,</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>leading<span class="token punctuation">,</span> <span class="token comment">//&#x5BFC;&#x822A;&#x680F;&#x6700;&#x5DE6;&#x4FA7;Widget&#xFF0C;&#x5E38;&#x89C1;&#x4E3A;&#x62BD;&#x5C49;&#x83DC;&#x5355;&#x6309;&#x94AE;&#x6216;&#x8FD4;&#x56DE;&#x6309;&#x94AE;&#x3002;</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>automaticallyImplyLeading <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token comment">//&#x5982;&#x679C;leading&#x4E3A;null&#xFF0C;&#x662F;&#x5426;&#x81EA;&#x52A8;&#x5B9E;&#x73B0;&#x9ED8;&#x8BA4;&#x7684;leading&#x6309;&#x94AE;</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>title<span class="token punctuation">,</span><span class="token comment">// &#x9875;&#x9762;&#x6807;&#x9898;</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>actions<span class="token punctuation">,</span> <span class="token comment">// &#x5BFC;&#x822A;&#x680F;&#x53F3;&#x4FA7;&#x83DC;&#x5355;</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>bottom<span class="token punctuation">,</span> <span class="token comment">// &#x5BFC;&#x822A;&#x680F;&#x5E95;&#x90E8;&#x83DC;&#x5355;&#xFF0C;&#x901A;&#x5E38;&#x4E3A;Tab&#x6309;&#x94AE;&#x7EC4;</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>elevation <span class="token operator">=</span> <span class="token number">4.0</span><span class="token punctuation">,</span> <span class="token comment">// &#x5BFC;&#x822A;&#x680F;&#x9634;&#x5F71;</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>centerTitle<span class="token punctuation">,</span> <span class="token comment">//&#x6807;&#x9898;&#x662F;&#x5426;&#x5C45;&#x4E2D; </span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>backgroundColor<span class="token punctuation">,</span>
  <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>   <span class="token comment">//&#x5176;&#x5B83;&#x5C5E;&#x6027;&#x89C1;&#x6E90;&#x7801;&#x6CE8;&#x91CA;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x5982;&#x679C;&#x7ED9;<code>Scaffold</code>&#x6DFB;&#x52A0;&#x4E86;&#x62BD;&#x5C49;&#x83DC;&#x5355;&#xFF0C;&#x9ED8;&#x8BA4;&#x60C5;&#x51B5;&#x4E0B;<code>Scaffold</code>&#x4F1A;&#x81EA;&#x52A8;&#x5C06;<code>AppBar</code>&#x7684;<code>leading</code>&#x8BBE;&#x7F6E;&#x4E3A;&#x83DC;&#x5355;&#x6309;&#x94AE;&#xFF08;&#x5982;&#x4E0A;&#x9762;&#x622A;&#x56FE;&#x6240;&#x793A;&#xFF09;&#xFF0C;&#x70B9;&#x51FB;&#x5B83;&#x4FBF;&#x53EF;&#x6253;&#x5F00;&#x62BD;&#x5C49;&#x83DC;&#x5355;&#x3002;&#x5982;&#x679C;&#x6211;&#x4EEC;&#x60F3;&#x81EA;&#x5B9A;&#x4E49;&#x83DC;&#x5355;&#x56FE;&#x6807;&#xFF0C;&#x53EF;&#x4EE5;&#x624B;&#x52A8;&#x6765;&#x8BBE;&#x7F6E;<code>leading</code>&#xFF0C;&#x5982;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">Scaffold</span><span class="token punctuation">(</span>
  appBar<span class="token punctuation">:</span> <span class="token function">AppBar</span><span class="token punctuation">(</span>
    title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;App Name&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    leading<span class="token punctuation">:</span> <span class="token function">Builder</span><span class="token punctuation">(</span>builder<span class="token punctuation">:</span> <span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> <span class="token function">IconButton</span><span class="token punctuation">(</span>
        icon<span class="token punctuation">:</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>dashboard<span class="token punctuation">,</span> color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>white<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment">//&#x81EA;&#x5B9A;&#x4E49;&#x56FE;&#x6807;</span>
        onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token comment">// &#x6253;&#x5F00;&#x62BD;&#x5C49;&#x83DC;&#x5355;  </span>
          Scaffold<span class="token punctuation">.</span><span class="token function">of</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">openDrawer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>  
  <span class="token punctuation">)</span>
</code></pre>
<p>&#x4EE3;&#x7801;&#x8FD0;&#x884C;&#x6548;&#x679C;&#x5982;&#x56FE;5-20&#x6240;&#x793A;&#xFF1A;</p>
<p><img src="https://pcdn.flutterchina.club/imgs/5-20.png" alt="&#x56FE;5-20"></p>
<p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x5DE6;&#x4FA7;&#x83DC;&#x5355;&#x5DF2;&#x7ECF;&#x66FF;&#x6362;&#x6210;&#x529F;&#x3002;</p>
<p>&#x4EE3;&#x7801;&#x4E2D;&#x6253;&#x5F00;&#x62BD;&#x5C49;&#x83DC;&#x5355;&#x7684;&#x65B9;&#x6CD5;&#x5728;<code>ScaffoldState</code>&#x4E2D;&#xFF0C;&#x901A;&#x8FC7;<code>Scaffold.of(context)</code>&#x53EF;&#x4EE5;&#x83B7;&#x53D6;&#x7236;&#x7EA7;&#x6700;&#x8FD1;&#x7684;<code>Scaffold</code> &#x7EC4;&#x4EF6;&#x7684;<code>State</code>&#x5BF9;&#x8C61;&#x3002;</p>
<h3 id="tabbar">TabBar</h3>
<p>&#x4E0B;&#x9762;&#x6211;&#x4EEC;&#x901A;&#x8FC7;&#x201C;bottom&#x201D;&#x5C5E;&#x6027;&#x6765;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A;&#x5BFC;&#x822A;&#x680F;&#x5E95;&#x90E8;Tab&#x6309;&#x94AE;&#x7EC4;&#xFF0C;&#x5C06;&#x8981;&#x5B9E;&#x73B0;&#x7684;&#x6548;&#x679C;&#x5982;&#x56FE;5-21&#x6240;&#x793A;&#xFF1A;</p>
<p><img src="https://pcdn.flutterchina.club/imgs/5-21.png" alt="&#x56FE;5-21"></p>
<p>Material&#x7EC4;&#x4EF6;&#x5E93;&#x4E2D;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;<code>TabBar</code>&#x7EC4;&#x4EF6;&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x5FEB;&#x901F;&#x751F;&#x6210;<code>Tab</code>&#x83DC;&#x5355;&#xFF0C;&#x4E0B;&#x9762;&#x662F;&#x4E0A;&#x56FE;&#x5BF9;&#x5E94;&#x7684;&#x6E90;&#x7801;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">_ScaffoldRouteState</span> <span class="token keyword">extends</span> <span class="token class-name">State</span><span class="token operator">&lt;</span>ScaffoldRoute<span class="token operator">&gt;</span>
    <span class="token keyword">with</span> SingleTickerProviderStateMixin <span class="token punctuation">{</span>

  TabController _tabController<span class="token punctuation">;</span> <span class="token comment">//&#x9700;&#x8981;&#x5B9A;&#x4E49;&#x4E00;&#x4E2A;Controller</span>
  List tabs <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">&quot;&#x65B0;&#x95FB;&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;&#x5386;&#x53F2;&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;&#x56FE;&#x7247;&quot;</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

  <span class="token metadata symbol">@override</span>
  <span class="token keyword">void</span> <span class="token function">initState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">initState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">// &#x521B;&#x5EFA;Controller  </span>
    _tabController <span class="token operator">=</span> <span class="token function">TabController</span><span class="token punctuation">(</span>length<span class="token punctuation">:</span> tabs<span class="token punctuation">.</span>length<span class="token punctuation">,</span> vsync<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">Scaffold</span><span class="token punctuation">(</span>
      appBar<span class="token punctuation">:</span> <span class="token function">AppBar</span><span class="token punctuation">(</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> <span class="token comment">//&#x7701;&#x7565;&#x65E0;&#x5173;&#x4EE3;&#x7801;</span>
        bottom<span class="token punctuation">:</span> <span class="token function">TabBar</span><span class="token punctuation">(</span>   <span class="token comment">//&#x751F;&#x6210;Tab&#x83DC;&#x5355;</span>
          controller<span class="token punctuation">:</span> _tabController<span class="token punctuation">,</span>
          tabs<span class="token punctuation">:</span> tabs<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">Tab</span><span class="token punctuation">(</span>text<span class="token punctuation">:</span> e<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toList</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> <span class="token comment">//&#x7701;&#x7565;&#x65E0;&#x5173;&#x4EE3;&#x7801;</span>

  <span class="token punctuation">}</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x9996;&#x5148;&#x521B;&#x5EFA;&#x4E86;&#x4E00;&#x4E2A;<code>TabController</code> &#xFF0C;&#x5B83;&#x662F;&#x7528;&#x4E8E;&#x63A7;&#x5236;/&#x76D1;&#x542C;<code>Tab</code>&#x83DC;&#x5355;&#x5207;&#x6362;&#x7684;&#x3002;&#x63A5;&#x4E0B;&#x6765;&#x901A;&#x8FC7;TabBar&#x751F;&#x6210;&#x4E86;&#x4E00;&#x4E2A;&#x5E95;&#x90E8;&#x83DC;&#x5355;&#x680F;&#xFF0C;<code>TabBar</code>&#x7684;<code>tabs</code>&#x5C5E;&#x6027;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;Widget&#x6570;&#x7EC4;&#xFF0C;&#x8868;&#x793A;&#x6BCF;&#x4E00;&#x4E2A;Tab&#x5B50;&#x83DC;&#x5355;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x81EA;&#x5B9A;&#x4E49;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x50CF;&#x793A;&#x4F8B;&#x4E2D;&#x4E00;&#x6837;&#x76F4;&#x63A5;&#x4F7F;&#x7528;<code>Tab</code> &#x7EC4;&#x4EF6;&#xFF0C;&#x5B83;&#x662F;Material&#x7EC4;&#x4EF6;&#x5E93;&#x63D0;&#x4F9B;&#x7684;Material&#x98CE;&#x683C;&#x7684;Tab&#x83DC;&#x5355;&#x3002;</p>
<p><code>Tab</code>&#x7EC4;&#x4EF6;&#x6709;&#x4E09;&#x4E2A;&#x53EF;&#x9009;&#x53C2;&#x6570;&#xFF0C;&#x9664;&#x4E86;&#x53EF;&#x4EE5;&#x6307;&#x5B9A;&#x6587;&#x5B57;&#x5916;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x6307;&#x5B9A;Tab&#x83DC;&#x5355;&#x56FE;&#x6807;&#xFF0C;&#x6216;&#x8005;&#x76F4;&#x63A5;&#x81EA;&#x5B9A;&#x4E49;&#x7EC4;&#x4EF6;&#x6837;&#x5F0F;&#x3002;<code>Tab</code>&#x7EC4;&#x4EF6;&#x5B9A;&#x4E49;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">Tab</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  Key key<span class="token punctuation">,</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>text<span class="token punctuation">,</span> <span class="token comment">// &#x83DC;&#x5355;&#x6587;&#x672C;</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>icon<span class="token punctuation">,</span> <span class="token comment">// &#x83DC;&#x5355;&#x56FE;&#x6807;</span>
  <span class="token keyword">this</span><span class="token punctuation">.</span>child<span class="token punctuation">,</span> <span class="token comment">// &#x81EA;&#x5B9A;&#x4E49;&#x7EC4;&#x4EF6;&#x6837;&#x5F0F;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x5F00;&#x53D1;&#x8005;&#x53EF;&#x4EE5;&#x6839;&#x636E;&#x5B9E;&#x9645;&#x9700;&#x6C42;&#x6765;&#x5B9A;&#x5236;&#x3002;</p>
<h3 id="tabbarview">TabBarView</h3>
<p>&#x901A;&#x8FC7;<code>TabBar</code>&#x6211;&#x4EEC;&#x53EA;&#x80FD;&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x9759;&#x6001;&#x7684;&#x83DC;&#x5355;&#xFF0C;&#x771F;&#x6B63;&#x7684;Tab&#x9875;&#x8FD8;&#x6CA1;&#x6709;&#x5B9E;&#x73B0;&#x3002;&#x7531;&#x4E8E;<code>Tab</code>&#x83DC;&#x5355;&#x548C;Tab&#x9875;&#x7684;&#x5207;&#x6362;&#x9700;&#x8981;&#x540C;&#x6B65;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x901A;&#x8FC7;<code>TabController</code>&#x53BB;&#x76D1;&#x542C;Tab&#x83DC;&#x5355;&#x7684;&#x5207;&#x6362;&#x53BB;&#x5207;&#x6362;Tab&#x9875;&#xFF0C;&#x4EE3;&#x7801;&#x5982;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart">_tabController<span class="token punctuation">.</span><span class="token function">addListener</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>  
  <span class="token keyword">switch</span><span class="token punctuation">(</span>_tabController<span class="token punctuation">.</span>index<span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token keyword">case</span> <span class="token number">1</span><span class="token punctuation">:</span> <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> <span class="token number">2</span><span class="token punctuation">:</span> <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> <span class="token punctuation">;</span>   
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x5982;&#x679C;&#x6211;&#x4EEC;Tab&#x9875;&#x53EF;&#x4EE5;&#x6ED1;&#x52A8;&#x5207;&#x6362;&#x7684;&#x8BDD;&#xFF0C;&#x8FD8;&#x9700;&#x8981;&#x5728;&#x6ED1;&#x52A8;&#x8FC7;&#x7A0B;&#x4E2D;&#x66F4;&#x65B0;TabBar&#x6307;&#x793A;&#x5668;&#x7684;&#x504F;&#x79FB;&#xFF01;&#x663E;&#x7136;&#xFF0C;&#x8981;&#x624B;&#x52A8;&#x5904;&#x7406;&#x8FD9;&#x4E9B;&#x662F;&#x5F88;&#x9EBB;&#x70E6;&#x7684;&#xFF0C;&#x4E3A;&#x6B64;&#xFF0C;Material&#x5E93;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;<code>TabBarView</code>&#x7EC4;&#x4EF6;&#xFF0C;&#x901A;&#x8FC7;&#x5B83;&#x4E0D;&#x4EC5;&#x53EF;&#x4EE5;&#x8F7B;&#x677E;&#x7684;&#x5B9E;&#x73B0;Tab&#x9875;&#xFF0C;&#x800C;&#x4E14;&#x53EF;&#x4EE5;&#x975E;&#x5E38;&#x5BB9;&#x6613;&#x7684;&#x914D;&#x5408;TabBar&#x6765;&#x5B9E;&#x73B0;&#x540C;&#x6B65;&#x5207;&#x6362;&#x548C;&#x6ED1;&#x52A8;&#x72B6;&#x6001;&#x540C;&#x6B65;&#xFF0C;&#x793A;&#x4F8B;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">Scaffold</span><span class="token punctuation">(</span>
  appBar<span class="token punctuation">:</span> <span class="token function">AppBar</span><span class="token punctuation">(</span>
    <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> <span class="token comment">//&#x7701;&#x7565;&#x65E0;&#x5173;&#x4EE3;&#x7801;</span>
    bottom<span class="token punctuation">:</span> <span class="token function">TabBar</span><span class="token punctuation">(</span>
      controller<span class="token punctuation">:</span> _tabController<span class="token punctuation">,</span>
      tabs<span class="token punctuation">:</span> tabs<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">Tab</span><span class="token punctuation">(</span>text<span class="token punctuation">:</span> e<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toList</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">)</span><span class="token punctuation">,</span>
  drawer<span class="token punctuation">:</span> <span class="token keyword">new</span> <span class="token class-name">MyDrawer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  body<span class="token punctuation">:</span> <span class="token function">TabBarView</span><span class="token punctuation">(</span>
    controller<span class="token punctuation">:</span> _tabController<span class="token punctuation">,</span>
    children<span class="token punctuation">:</span> tabs<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">//&#x521B;&#x5EFA;3&#x4E2A;Tab&#x9875;</span>
      <span class="token keyword">return</span> <span class="token function">Container</span><span class="token punctuation">(</span>
        alignment<span class="token punctuation">:</span> Alignment<span class="token punctuation">.</span>center<span class="token punctuation">,</span>
        child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span>e<span class="token punctuation">,</span> textScaleFactor<span class="token punctuation">:</span> <span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toList</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> <span class="token comment">// &#x7701;&#x7565;&#x65E0;&#x5173;&#x4EE3;&#x7801;  </span>
<span class="token punctuation">)</span>
</code></pre>
<p>&#x8FD0;&#x884C;&#x540E;&#x6548;&#x679C;&#x5982;&#x56FE;5-22&#x6240;&#x793A;&#xFF1A;</p>
<p><img src="https://pcdn.flutterchina.club/imgs/5-22.png" alt="&#x56FE;5-22"></p>
<p>&#x73B0;&#x5728;&#xFF0C;&#x65E0;&#x8BBA;&#x662F;&#x70B9;&#x51FB;&#x5BFC;&#x822A;&#x680F;Tab&#x83DC;&#x5355;&#x8FD8;&#x662F;&#x5728;&#x9875;&#x9762;&#x4E0A;&#x5DE6;&#x53F3;&#x6ED1;&#x52A8;&#xFF0C;Tab&#x9875;&#x9762;&#x90FD;&#x4F1A;&#x5207;&#x6362;&#xFF0C;&#x5E76;&#x4E14;Tab&#x83DC;&#x5355;&#x7684;&#x72B6;&#x6001;&#x548C;Tab&#x9875;&#x9762;&#x59CB;&#x7EC8;&#x4FDD;&#x6301;&#x540C;&#x6B65;&#xFF01;&#x90A3;&#x5B83;&#x4EEC;&#x662F;&#x5982;&#x4F55;&#x5B9E;&#x73B0;&#x540C;&#x6B65;&#x7684;&#x5462;&#xFF1F;&#x7EC6;&#x5FC3;&#x7684;&#x8BFB;&#x8005;&#x53EF;&#x80FD;&#x5DF2;&#x7ECF;&#x53D1;&#x73B0;&#xFF0C;&#x4E0A;&#x4F8B;&#x4E2D;<code>TabBar</code>&#x548C;<code>TabBarView</code>&#x7684;<code>controller</code>&#x662F;&#x540C;&#x4E00;&#x4E2A;&#xFF01;&#x6B63;&#x662F;&#x5982;&#x6B64;&#xFF0C;<code>TabBar</code>&#x548C;<code>TabBarView</code>&#x6B63;&#x662F;&#x901A;&#x8FC7;&#x540C;&#x4E00;&#x4E2A;<code>controller</code>&#x6765;&#x5B9E;&#x73B0;&#x83DC;&#x5355;&#x5207;&#x6362;&#x548C;&#x6ED1;&#x52A8;&#x72B6;&#x6001;&#x540C;&#x6B65;&#x7684;&#xFF0C;&#x6709;&#x5173;<code>TabController</code>&#x7684;&#x8BE6;&#x7EC6;&#x4FE1;&#x606F;&#xFF0C;&#x6211;&#x4EEC;&#x4E0D;&#x5728;&#x672C;&#x4E66;&#x505A;&#x8FC7;&#x591A;&#x4ECB;&#x7ECD;&#xFF0C;&#x4F7F;&#x7528;&#x65F6;&#x8BFB;&#x8005;&#x76F4;&#x63A5;&#x67E5;&#x770B;SDK&#x5373;&#x53EF;&#x3002;</p>
<p>&#x53E6;&#x5916;&#xFF0C;Material&#x7EC4;&#x4EF6;&#x5E93;&#x4E5F;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;<code>PageView</code> &#x7EC4;&#x4EF6;&#xFF0C;&#x5B83;&#x548C;<code>TabBarView</code>&#x529F;&#x80FD;&#x76F8;&#x4F3C;&#xFF0C;&#x8BFB;&#x8005;&#x53EF;&#x4EE5;&#x81EA;&#x884C;&#x4E86;&#x89E3;&#x4E00;&#x4E0B;&#x3002;</p>
<h2 id="563-&#x62BD;&#x5C49;&#x83DC;&#x5355;drawer">5.6.3 &#x62BD;&#x5C49;&#x83DC;&#x5355;Drawer</h2>
<p><code>Scaffold</code>&#x7684;<code>drawer</code>&#x548C;<code>endDrawer</code>&#x5C5E;&#x6027;&#x53EF;&#x4EE5;&#x5206;&#x522B;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;Widget&#x6765;&#x4F5C;&#x4E3A;&#x9875;&#x9762;&#x7684;&#x5DE6;&#x3001;&#x53F3;&#x62BD;&#x5C49;&#x83DC;&#x5355;&#x3002;&#x5982;&#x679C;&#x5F00;&#x53D1;&#x8005;&#x63D0;&#x4F9B;&#x4E86;&#x62BD;&#x5C49;&#x83DC;&#x5355;&#xFF0C;&#x90A3;&#x4E48;&#x5F53;&#x7528;&#x6237;&#x624B;&#x6307;&#x4ECE;&#x5C4F;&#x5E55;&#x5DE6;&#xFF08;&#x6216;&#x53F3;&#xFF09;&#x4FA7;&#x5411;&#x91CC;&#x6ED1;&#x52A8;&#x65F6;&#x4FBF;&#x53EF;&#x6253;&#x5F00;&#x62BD;&#x5C49;&#x83DC;&#x5355;&#x3002;&#x672C;&#x8282;&#x5F00;&#x59CB;&#x90E8;&#x5206;&#x7684;&#x793A;&#x4F8B;&#x4E2D;&#x5B9E;&#x73B0;&#x4E86;&#x4E00;&#x4E2A;&#x5DE6;&#x62BD;&#x5C49;&#x83DC;&#x5355;<code>MyDrawer</code>&#xFF0C;&#x5B83;&#x7684;&#x6E90;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">MyDrawer</span> <span class="token keyword">extends</span> <span class="token class-name">StatelessWidget</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> <span class="token function">MyDrawer</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    Key key<span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">:</span> <span class="token keyword">super</span><span class="token punctuation">(</span>key<span class="token punctuation">:</span> key<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">Drawer</span><span class="token punctuation">(</span>
      child<span class="token punctuation">:</span> MediaQuery<span class="token punctuation">.</span><span class="token function">removePadding</span><span class="token punctuation">(</span>
        context<span class="token punctuation">:</span> context<span class="token punctuation">,</span>
        <span class="token comment">//&#x79FB;&#x9664;&#x62BD;&#x5C49;&#x83DC;&#x5355;&#x9876;&#x90E8;&#x9ED8;&#x8BA4;&#x7559;&#x767D;</span>
        removeTop<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
        child<span class="token punctuation">:</span> <span class="token function">Column</span><span class="token punctuation">(</span>
          crossAxisAlignment<span class="token punctuation">:</span> CrossAxisAlignment<span class="token punctuation">.</span>start<span class="token punctuation">,</span>
          children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
            <span class="token function">Padding</span><span class="token punctuation">(</span>
              padding<span class="token punctuation">:</span> <span class="token keyword">const</span> EdgeInsets<span class="token punctuation">.</span><span class="token function">only</span><span class="token punctuation">(</span>top<span class="token punctuation">:</span> <span class="token number">38.0</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
              child<span class="token punctuation">:</span> <span class="token function">Row</span><span class="token punctuation">(</span>
                children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
                  <span class="token function">Padding</span><span class="token punctuation">(</span>
                    padding<span class="token punctuation">:</span> <span class="token keyword">const</span> EdgeInsets<span class="token punctuation">.</span><span class="token function">symmetric</span><span class="token punctuation">(</span>horizontal<span class="token punctuation">:</span> <span class="token number">16.0</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
                    child<span class="token punctuation">:</span> <span class="token function">ClipOval</span><span class="token punctuation">(</span>
                      child<span class="token punctuation">:</span> Image<span class="token punctuation">.</span><span class="token function">asset</span><span class="token punctuation">(</span>
                        <span class="token string">&quot;imgs/avatar.png&quot;</span><span class="token punctuation">,</span>
                        width<span class="token punctuation">:</span> <span class="token number">80</span><span class="token punctuation">,</span>
                      <span class="token punctuation">)</span><span class="token punctuation">,</span>
                    <span class="token punctuation">)</span><span class="token punctuation">,</span>
                  <span class="token punctuation">)</span><span class="token punctuation">,</span>
                  <span class="token function">Text</span><span class="token punctuation">(</span>
                    <span class="token string">&quot;Wendux&quot;</span><span class="token punctuation">,</span>
                    style<span class="token punctuation">:</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>fontWeight<span class="token punctuation">:</span> FontWeight<span class="token punctuation">.</span>bold<span class="token punctuation">)</span><span class="token punctuation">,</span>
                  <span class="token punctuation">)</span>
                <span class="token punctuation">]</span><span class="token punctuation">,</span>
              <span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token function">Expanded</span><span class="token punctuation">(</span>
              child<span class="token punctuation">:</span> <span class="token function">ListView</span><span class="token punctuation">(</span>
                children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
                  <span class="token function">ListTile</span><span class="token punctuation">(</span>
                    leading<span class="token punctuation">:</span> <span class="token keyword">const</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>add<span class="token punctuation">)</span><span class="token punctuation">,</span>
                    title<span class="token punctuation">:</span> <span class="token keyword">const</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&apos;Add account&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
                  <span class="token punctuation">)</span><span class="token punctuation">,</span>
                  <span class="token function">ListTile</span><span class="token punctuation">(</span>
                    leading<span class="token punctuation">:</span> <span class="token keyword">const</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>settings<span class="token punctuation">)</span><span class="token punctuation">,</span>
                    title<span class="token punctuation">:</span> <span class="token keyword">const</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&apos;Manage accounts&apos;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
                  <span class="token punctuation">)</span><span class="token punctuation">,</span>
                <span class="token punctuation">]</span><span class="token punctuation">,</span>
              <span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">]</span><span class="token punctuation">,</span>
        <span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x62BD;&#x5C49;&#x83DC;&#x5355;&#x901A;&#x5E38;&#x5C06;<code>Drawer</code>&#x7EC4;&#x4EF6;&#x4F5C;&#x4E3A;&#x6839;&#x8282;&#x70B9;&#xFF0C;&#x5B83;&#x5B9E;&#x73B0;&#x4E86;Material&#x98CE;&#x683C;&#x7684;&#x83DC;&#x5355;&#x9762;&#x677F;&#xFF0C;<code>MediaQuery.removePadding</code>&#x53EF;&#x4EE5;&#x79FB;&#x9664;Drawer&#x9ED8;&#x8BA4;&#x7684;&#x4E00;&#x4E9B;&#x7559;&#x767D;&#xFF08;&#x6BD4;&#x5982;Drawer&#x9ED8;&#x8BA4;&#x9876;&#x90E8;&#x4F1A;&#x7559;&#x548C;&#x624B;&#x673A;&#x72B6;&#x6001;&#x680F;&#x7B49;&#x9AD8;&#x7684;&#x7559;&#x767D;&#xFF09;&#xFF0C;&#x8BFB;&#x8005;&#x53EF;&#x4EE5;&#x5C1D;&#x8BD5;&#x4F20;&#x9012;&#x4E0D;&#x540C;&#x7684;&#x53C2;&#x6570;&#x6765;&#x770B;&#x770B;&#x5B9E;&#x9645;&#x6548;&#x679C;&#x3002;&#x62BD;&#x5C49;&#x83DC;&#x5355;&#x9875;&#x7531;&#x9876;&#x90E8;&#x548C;&#x5E95;&#x90E8;&#x7EC4;&#x6210;&#xFF0C;&#x9876;&#x90E8;&#x7531;&#x7528;&#x6237;&#x5934;&#x50CF;&#x548C;&#x6635;&#x79F0;&#x7EC4;&#x6210;&#xFF0C;&#x5E95;&#x90E8;&#x662F;&#x4E00;&#x4E2A;&#x83DC;&#x5355;&#x5217;&#x8868;&#xFF0C;&#x7528;ListView&#x5B9E;&#x73B0;&#xFF0C;&#x5173;&#x4E8E;ListView&#x6211;&#x4EEC;&#x5C06;&#x5728;&#x540E;&#x9762;&#x201C;&#x53EF;&#x6EDA;&#x52A8;&#x7EC4;&#x4EF6;&#x201D;&#x4E00;&#x8282;&#x8BE6;&#x7EC6;&#x4ECB;&#x7ECD;&#x3002;</p>
<h2 id="564-floatingactionbutton">5.6.4 FloatingActionButton</h2>
<p><code>FloatingActionButton</code>&#x662F;Material&#x8BBE;&#x8BA1;&#x89C4;&#x8303;&#x4E2D;&#x7684;&#x4E00;&#x79CD;&#x7279;&#x6B8A;Button&#xFF0C;&#x901A;&#x5E38;&#x60AC;&#x6D6E;&#x5728;&#x9875;&#x9762;&#x7684;&#x67D0;&#x4E00;&#x4E2A;&#x4F4D;&#x7F6E;&#x4F5C;&#x4E3A;&#x67D0;&#x79CD;&#x5E38;&#x7528;&#x52A8;&#x4F5C;&#x7684;&#x5FEB;&#x6377;&#x5165;&#x53E3;&#xFF0C;&#x5982;&#x672C;&#x8282;&#x793A;&#x4F8B;&#x4E2D;&#x9875;&#x9762;&#x53F3;&#x4E0B;&#x89D2;&#x7684;&quot;&#x2795;&quot;&#x53F7;&#x6309;&#x94AE;&#x3002;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<code>Scaffold</code>&#x7684;<code>floatingActionButton</code>&#x5C5E;&#x6027;&#x6765;&#x8BBE;&#x7F6E;&#x4E00;&#x4E2A;<code>FloatingActionButton</code>&#xFF0C;&#x540C;&#x65F6;&#x901A;&#x8FC7;<code>floatingActionButtonLocation</code>&#x5C5E;&#x6027;&#x6765;&#x6307;&#x5B9A;&#x5176;&#x5728;&#x9875;&#x9762;&#x4E2D;&#x60AC;&#x6D6E;&#x7684;&#x4F4D;&#x7F6E;&#xFF0C;&#x8FD9;&#x4E2A;&#x6BD4;&#x8F83;&#x7B80;&#x5355;&#xFF0C;&#x4E0D;&#x518D;&#x8D58;&#x8FF0;&#x3002;</p>
<h2 id="565--&#x5E95;&#x90E8;tab&#x5BFC;&#x822A;&#x680F;">5.6.5  &#x5E95;&#x90E8;Tab&#x5BFC;&#x822A;&#x680F;</h2>
<p>&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<code>Scaffold</code>&#x7684;<code>bottomNavigationBar</code>&#x5C5E;&#x6027;&#x6765;&#x8BBE;&#x7F6E;&#x5E95;&#x90E8;&#x5BFC;&#x822A;&#xFF0C;&#x5982;&#x672C;&#x8282;&#x5F00;&#x59CB;&#x793A;&#x4F8B;&#x6240;&#x793A;&#xFF0C;&#x6211;&#x4EEC;&#x901A;&#x8FC7;Material&#x7EC4;&#x4EF6;&#x5E93;&#x63D0;&#x4F9B;&#x7684;<code>BottomNavigationBar</code>&#x548C;<code>BottomNavigationBarItem</code>&#x4E24;&#x79CD;&#x7EC4;&#x4EF6;&#x6765;&#x5B9E;&#x73B0;Material&#x98CE;&#x683C;&#x7684;&#x5E95;&#x90E8;&#x5BFC;&#x822A;&#x680F;&#x3002;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x4E0A;&#x9762;&#x7684;&#x5B9E;&#x73B0;&#x4EE3;&#x7801;&#x975E;&#x5E38;&#x7B80;&#x5355;&#xFF0C;&#x6240;&#x4EE5;&#x4E0D;&#x518D;&#x8D58;&#x8FF0;&#xFF0C;&#x4F46;&#x662F;&#x5982;&#x679C;&#x6211;&#x4EEC;&#x60F3;&#x5B9E;&#x73B0;&#x5982;&#x56FE;5-23&#x6240;&#x793A;&#x6548;&#x679C;&#x7684;&#x5E95;&#x90E8;&#x5BFC;&#x822A;&#x680F;&#x5E94;&#x8BE5;&#x600E;&#x4E48;&#x505A;&#x5462;&#xFF1F;</p>
<p><img src="https://pcdn.flutterchina.club/imgs/5-23.png" alt="&#x56FE;5-23"></p>
<p>Material&#x7EC4;&#x4EF6;&#x5E93;&#x4E2D;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;<code>BottomAppBar</code> &#x7EC4;&#x4EF6;&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x548C;<code>FloatingActionButton</code>&#x914D;&#x5408;&#x5B9E;&#x73B0;&#x8FD9;&#x79CD;&#x201C;&#x6253;&#x6D1E;&#x201D;&#x6548;&#x679C;&#xFF0C;&#x6E90;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart">bottomNavigationBar<span class="token punctuation">:</span> <span class="token function">BottomAppBar</span><span class="token punctuation">(</span>
  color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>white<span class="token punctuation">,</span>
  shape<span class="token punctuation">:</span> <span class="token function">CircularNotchedRectangle</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment">// &#x5E95;&#x90E8;&#x5BFC;&#x822A;&#x680F;&#x6253;&#x4E00;&#x4E2A;&#x5706;&#x5F62;&#x7684;&#x6D1E;</span>
  child<span class="token punctuation">:</span> <span class="token function">Row</span><span class="token punctuation">(</span>
    children<span class="token punctuation">:</span> <span class="token punctuation">[</span>
      <span class="token function">IconButton</span><span class="token punctuation">(</span>icon<span class="token punctuation">:</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>home<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token function">SizedBox</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment">//&#x4E2D;&#x95F4;&#x4F4D;&#x7F6E;&#x7A7A;&#x51FA;</span>
      <span class="token function">IconButton</span><span class="token punctuation">(</span>icon<span class="token punctuation">:</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>business<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">]</span><span class="token punctuation">,</span>
    mainAxisAlignment<span class="token punctuation">:</span> MainAxisAlignment<span class="token punctuation">.</span>spaceAround<span class="token punctuation">,</span> <span class="token comment">//&#x5747;&#x5206;&#x5E95;&#x90E8;&#x5BFC;&#x822A;&#x680F;&#x6A2A;&#x5411;&#x7A7A;&#x95F4;</span>
  <span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span>
</code></pre>
<p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#xFF0C;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#x6CA1;&#x6709;&#x63A7;&#x5236;&#x6253;&#x6D1E;&#x4F4D;&#x7F6E;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x5B9E;&#x9645;&#x4E0A;&#xFF0C;&#x6253;&#x6D1E;&#x7684;&#x4F4D;&#x7F6E;&#x53D6;&#x51B3;&#x4E8E;<code>FloatingActionButton</code>&#x7684;&#x4F4D;&#x7F6E;&#xFF0C;&#x4E0A;&#x9762;<code>FloatingActionButton</code>&#x7684;&#x4F4D;&#x7F6E;&#x4E3A;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart">floatingActionButtonLocation<span class="token punctuation">:</span> FloatingActionButtonLocation<span class="token punctuation">.</span>centerDocked<span class="token punctuation">,</span>
</code></pre>
<p>&#x6240;&#x4EE5;&#x6253;&#x6D1E;&#x4F4D;&#x7F6E;&#x5728;&#x5E95;&#x90E8;&#x5BFC;&#x822A;&#x680F;&#x7684;&#x6B63;&#x4E2D;&#x95F4;&#x3002;</p>
<p><code>BottomAppBar</code>&#x7684;<code>shape</code>&#x5C5E;&#x6027;&#x51B3;&#x5B9A;&#x6D1E;&#x7684;&#x5916;&#x5F62;&#xFF0C;<code>CircularNotchedRectangle</code>&#x5B9E;&#x73B0;&#x4E86;&#x4E00;&#x4E2A;&#x5706;&#x5F62;&#x7684;&#x5916;&#x5F62;&#xFF0C;&#x6211;&#x4EEC;&#x4E5F;&#x53EF;&#x4EE5;&#x81EA;&#x5B9A;&#x4E49;&#x5916;&#x5F62;&#xFF0C;&#x6BD4;&#x5982;&#xFF0C;Flutter Gallery&#x793A;&#x4F8B;&#x4E2D;&#x5C31;&#x6709;&#x4E00;&#x4E2A;&#x201C;&#x94BB;&#x77F3;&#x201D;&#x5F62;&#x72B6;&#x7684;&#x793A;&#x4F8B;&#xFF0C;&#x8BFB;&#x8005;&#x611F;&#x5174;&#x8DA3;&#x53EF;&#x4EE5;&#x81EA;&#x884C;&#x67E5;&#x770B;&#x3002;</p>

                                
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